Outlook was first introduced in Office 97 which had the version number 8.0. This is because Office 2016 and Office 2019 now use the same code-base as Microsoft 365 and your license determines which features are enabled.Īt the same time, this change also increases (or to be more technically correct doesn’t decrease) compatibility with add-ins and external applications which explicitly look at the version number. HKEY_CURRENT_USER\Software\Microsoft\Office\ \Outlook Office 2019 is not version 17.0?Īs you can see, since Outlook 2016 the version number is stuck at 16.0 and Office 2019 didn’t become version 17.0. This version number is used for stamping the installation files of Outlook and is also used in the Registry, with the most known Registry hive being Outlook 2013, Outlook 2016, Outlook 2019 and Microsoft 365Īn overview of the released versions of Outlook and their version numbers Version Name.You can look up the build number of Outlook in the following way:įile-> Help-> About-> Additional Version and Copyright Information side from Outlook 98, this second number is always 0. The version number of Outlook relates to the first 2 numbers of the entire build number as reported in Outlook’s About dialog. What are the build numbers of the Service Pack releases?.
What are the version numbers of Outlook and their released names?.Some trivia about Outlook version numbers
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